Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1e9d6aa8813827…

MALICIOUS

PDF

95.3 KB Created: 2021-03-31 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ddc22d11ea49e36ca45e001320ed173 SHA-1: 5397315a46d8cdf977d69906676d0e4ec8b88fc7 SHA-256: 3b1e9d6aa88138270b385fd700cf75cebbca5d2dadb16f3515a5256287f0d8f3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/award?keyword=calibration+standard+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377663/normal_60513853165c5.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/g3hjthh/73910190594.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/nlhbDje/10437978388.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/5041396.pdfIn PDF document text
    • https://vuvitolivudiru.weebly.com/uploads/1/3/2/7/132712253/9295095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_5fd9b52910e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_601da31657303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_600bc145a56a0.pdfIn PDF document text
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/mivig-fiwerizag-demezi.pdfIn PDF document text
    • http://zudalipa.22web.org/dozuze.pdfIn PDF document text
    • https://gavibokilixebil.weebly.com/uploads/1/3/4/7/134716725/kawuporesixaveb_rikebokiwafirel_zenewiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/cjaPihg/lucky_life_number_8.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/gjEqXvr/jujutaromaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kawanasigupezin.epizy.com/balance_sheet_solved_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2394b26f-72bb-4775-aefe-8defe223a5a0/tokufifiwuguxubig.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/consumer_reports_mattress_buying_guide_issue.pdfIn PDF document text
    • http://bitezopunofiwu.rf.gd/dedagitapidodabuweze.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/52434311120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9de28e3-caca-43bb-abcb-be2912b581e1/waloduvazisipajij.pdfIn PDF document text
    • http://nasujaguza.epizy.com/short_detective_stories_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b261d4d5-c921-4cd0-9506-9707a2f4d0a6/rivofirikafuzexu.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/ecole_de_formation_en_aviculture_au_maroc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c950a7-fefb-4d07-aac7-bb3039eba375/tikerex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9691c9-9b73-4ff3-b82e-0182112e54e9/how_many_calories_in_an_einstein_sesame_bagel.pdfIn PDF document text
    • http://fenelepor.epizy.com/south_indian_love_story_movies_list_2019.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 5080 bytes
SHA-256: f2e0efafc76e4a60da6ae6ece621bc3179ee782917209ce8bc9af9919ce77cc9
font_01_sfnt_off00014943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 11424 bytes
SHA-256: a18fbb7a300fa8ea073f13d9d4082a19bffa7eec16a0efa071921bdb31b14798

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